Table 1.
Baseline characteristics of the two study groups
| OSA (n = 30) | Control (n = 23) | P* | |
|---|---|---|---|
| Age (yrs) | 45.2 (9.6) | 41.3 (9.3) | 0.14 |
| BMI (kg/m2) | 33.3 (4.6) | 25.6 (2.9) | < 0.01 |
| NART | 109.0 (8.0) | 115.5 (8.3) | < 0.01 |
| AHI | 71.5 (16.2) | 5.3 (3.9) | < 0.01 |
| % SpO2 < 90% | 38.6 (19.3) | 0.02 (0.07) | < 0.01 |
| % SpO2 < 80% | 9.6 (14.4) | 0.0 (0.0) | < 0.01 |
| % Stage 1/2 | 68.9 (15.8) | 60.1 (10.5) | 0.02 |
| % Stage 3/4 | 17.7 (14.7) | 21.1 (9.9) | 0.32 |
| % REM | 13.4 (5.5) | 17.7 (4.9) | < 0.01 |
| Arousal Index | 55.1 (18.4) | 15.7 (9.6) | < 0.01 |
| ESS | 12.9 (4.3) | 5.2 (3.4) | < 0.01 |
All values are expressed as mean (SD). Definition of abbreviations: NART, National Adult Reading Task (full scale) score, a measure of premorbid IQ; AHI, apnea/hypopnea index; % SpO2 < 90% (80%), percent of total sleep time at diagnostic polysomnography spent at oxygen saturations less than 90% (80%); % Stage 1/2 (3/4)(REM), percent of total sleep time at diagnostic polysomnography spent in relevant stages; ESS, Epworth sleepiness score, a measure of subjective daytime sleepiness.
*
Independent samples t-tests.